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    <title>Document</title>
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  <body>
    <script>
      //请实现以下效果
      function add(a, b, c) {
        return a - b + c 
      }
      // console.log(add.length);

      // const res = add(1, 2, 3) //6
      //要求声明一个curry函数，函数add经过curry函数的处理后，每次调用只能接收一个参数 fn(x,y,z)
      const curry = (fn) => { //接收fn为形参
        return function (x) {
          return function (y) {
            return function (z) {
              return fn(x,y,z) //使用形参的方法
            }
          }
        }
      }

      let newCurry = curry(add) //传入add，使curry能适应add的方法
      // let addCurry = curry(add)

      // // console.log(addCurry);
      // const res2 = addCurry(1)(2)(3) //6

      const res2 = newCurry(1)(2)(3)
      console.log(res2)
    </script>
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